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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flat 与 flatMap</title>
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    <script>
        //flat：平
        //将多维数组转化为低位数组
        // const arr1 = [1,2,3,4,[5,6]];
        // const arr2 = [1,2,3,4,[5,6,[7,8,9]]];
        //参数为深度 是一个数字
        // console.log(arr1.flat());  
        // console.log(arr2.flat());//[1,2,3,4,5,6,[7,8,9]]
        // console.log(arr2.flat(2)); 

        //flatMap
        const arr = [1, 2, 3, 4];
        const result = arr.flatMap(item => [item * 10]);
        console.log(result);
    </script>
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